# find . -name '.svn' => Find files and directories named exactly .svn in the current directory
# -print0             => Separate results with a NUL
# |                   => Pipe each result into the xargs program
# -0                  => xargs expects results to be separated by NUL
# -r rm -rf           => run rm -rf (delete recursively with force) on each result

find . -name '.svn' -print0 | xargs -0 -r rm -rf